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Chapter two test

CHAPTER 2 EKG TEST

QuestionAnswer
Inherent means natural conduction system It is the electrical system that keeps the heart beating
Inherent rate of the SA NODE ( sino- arial node) Inherent rate of the SA NODE = 60 --100 bpm First pacemaker
inherent rate of the AV NODE (Gatekeeper) (Arterial ventricular) Inherent rate of the AV NODE = 40 --60 bpm Second pacemaker
Inherent rate of the ventricle myocardial cells( PURKINJE fibers) Inherent rate of PURKINJE fibers =20--40 bpm Third pacemaker
Escape rhythm If the SA NODE FAILS THE AV NODE OR PURKINJE FIBERS START THE RYTHM OF THE HEART IT IS CALLED. ( escape RYTHM)
REFRACTORY PERIOD the time period when the myocardial cell cannot respond to stimulation ( rest period 1 micro second)
1 heart beat = 1 cardiac cycle
1 cardiac cycle is 1 systole and 1 diastole
SYSTOLIC BP = When heart is contracting 120 bpm
DIASTOLIC BP = When the heart is resting ( relaxing ) 80 bpm
SYSTOLIC Is the phase when the heart is contracting and pumping the blood
DIASTOLIC Is the phase when the heart is relaxing and filling with blood
ISO-ELECTRIC LINE OR BASE LINE It is the straight line on the EKG ( shows there is no electrical activity in the heart ) The baseline (or isoelectric line) is used as a reference point when centering the tracing
WAVE Any deflection away from the base line IS A WAVE ( if it is ABOVE THE BASELINE IT IS A POSITIVE WAVE) (If it is BELOW THE BASELINE IT IS A NEGATIVE)
segment/gap this is the space between two waves
Interval: the length of a wave and a segment is called
abnormal rhythms are considered arrhythmias.
Normal sinus rhythm is the term used to describe an ECG that falls within normal limits (WNL) 60 --100bpm
Sinus bradycardia is the term used to define a regular heart rate below 60 BPM, while. sinus tachycardia refers to a regular heart rate above 100 BPM.
Complex Two or more waves together
GALVANOMETER It converts the electricity current ( VOLTAGE ) coming from the heart into the Mechanical waves
THE MECHANICAL ACTION RESULTS In waves on EKG TRACING
AMPLIFIER Converts normal or below normal signals to more readable signals which Results in waves
to accurately interpret an ECG tracing, it must be performed correctly and be free of (artifacts or unwanted interference). If an artifact appears, the medical assistant should know how to locate the source and correct it
ARTIFACT FILTERS Reduces the amount of artifacts on the EKG
STYLUS Is a wire attached in the machine working as a pen (The writing implement on an EKG MACHINE )
EKG MACHINES DO NOT CONTAIN Ink the wire become hot and melts plastic It moves with the heart beat and makes tracing on EKG paper
the EKG which does INTERPRETATION is called An INTERPRETATION MACHINE
ACTION POTENTIAL is The ability of the myocardial cell to depolarizer and repolarizes
P WAVE This represents ATRIAL DEPOLARIZATION
QRS COMPLEX This represents VENTRICULAR DEPOLARIZATION
T WAVE This represents VENTRICULAR REPOLARIZATION
Pressure sensitive This is the heat sensitive EKG PAPER
This is heat sensitive EKG PAPER
Normal paper speed is 25 mm/ second
Normal standardization is 10mm
VERTICAL PLANE ON THE EKG PAPER REPRESENTS Voltage (mv) Vertical top to bottom
HORIZONTAL PLANE ON THE EKG PAPER REPRESENTS Time of waves (seconds) Horizontal side to side
How much time is one small square .04
How much time is one large square .20
The time period when the myocardial cells cannot respond to stimulus is called REFRACTORY PERIOD
The ability of the myocardial cell to depolarize and repolarize is called ACTION POTENTIAL
The part of the EKG MACHINE THAT CONVERTS ELECTRICAL ACTIVITY INTO MECHANICAL MOTION IS THE GALAVNOMETER
ON ALL SINUS ECGs THE INITIATION OF THE IMPULSE IS WHERE SA NODE
What is the normal value of the PRI ? -12 - .20 seconds
Example::::: after Jane's SA NODE starts to pace her heart at 115 bpm This is called Sinus tachycardia ( exercised endured)
1 SA NODE 2 atrial depolarization 3 AV NODE 4 bundle of his 5 R & L bundle branches 6 PURKINJE fibers 7 ventricular depolarization 8 ventricular REPOLARIZATION Conduction pathway
- RYTHM STRIP A separate 12 inch recording of a particular lead ( usually lead ll of the bottom)
RYTHM STRIP ASSISTS IN DETECTING PTs Abnormalities in PTs rhythms when it is not detectable on other leads
Created by: Tbella
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